refactor: Move RemoteA2AAgent to agent package; remove EXPERIMENTAL annotation; add LICENSE header

PiperOrigin-RevId: 880804505

Author: google-genai-bot

…a/com/google/adk/a2a/RemoteA2AAgent.java …google/adk/a2a/agent/RemoteA2AAgent.javaa2a/src/main/java/com/google/adk/a2a/RemoteA2AAgent.java renamed to a2a/src/main/java/com/google/adk/a2a/agent/RemoteA2AAgent.java a2a/src/main/java/com/google/adk/a2a/RemoteA2AAgent.java renamed to a2a/src/main/java/com/google/adk/a2a/agent/RemoteA2AAgent.java

@@ -1,4 +1,19 @@
-package com.google.adk.a2a;
+/*
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.google.adk.a2a.agent;
 
 import static com.google.common.base.Strings.nullToEmpty;
 
@@ -44,26 +59,21 @@
 import org.slf4j.LoggerFactory;
 
 /**
- * Agent that communicates with a remote A2A agent via A2A client.
- *
- * <p>This agent supports multiple ways to specify the remote agent:
+ * Agent that communicates with a remote A2A agent via an A2A client.
  *
- * <ol>
- *   <li>Direct AgentCard object
- *   <li>URL to agent card JSON
- *   <li>File path to agent card JSON
- * </ol>
+ * <p>The remote agent can be specified directly by providing an {@link AgentCard} to the builder,
+ * or it can be resolved automatically using the provided A2A client.
  *
- * <p>The agent handles:
+ * <p>Key responsibilities of this agent include:
  *
  * <ul>
  *   <li>Agent card resolution and validation
- *   <li>A2A message conversion and error handling
- *   <li>Session state management across requests
+ *   <li>Converting ADK session history events into A2A requests ({@link io.a2a.spec.Message})
+ *   <li>Handling streaming and non-streaming responses from the A2A client
+ *   <li>Buffering and aggregating streamed response chunks into ADK {@link
+ *       com.google.adk.events.Event}s
+ *   <li>Converting A2A client responses back into ADK format
  * </ul>
- *
- * <p>**EXPERIMENTAL:** Subject to change, rename, or removal in any future patch release. Do not
- * use in production code.
  */
 public class RemoteA2AAgent extends BaseAgent {
 

a2a/src/main/java/com/google/adk/a2a/common/A2AClientError.java

@@ -1,3 +1,18 @@
+/*
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package com.google.adk.a2a.common;
 
 /** Exception thrown when the A2A client encounters an error. */

a2a/src/main/java/com/google/adk/a2a/common/A2AMetadata.java

@@ -1,3 +1,18 @@
+/*
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package com.google.adk.a2a.common;
 
 /** Constants and utilities for A2A metadata keys. */

a2a/src/main/java/com/google/adk/a2a/common/GenAiFieldMissingException.java

@@ -1,3 +1,18 @@
+/*
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package com.google.adk.a2a.common;
 
 /** Exception thrown when the the genai class has an empty field. */

a2a/src/main/java/com/google/adk/a2a/converters/A2ADataPartMetadataType.java

@@ -1,3 +1,18 @@
+/*
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package com.google.adk.a2a.converters;
 
 /** Enum for the type of A2A DataPart metadata. */

a2a/src/main/java/com/google/adk/a2a/converters/EventConverter.java

@@ -1,3 +1,18 @@
+/*
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package com.google.adk.a2a.converters;
 
 import static com.google.common.collect.ImmutableList.toImmutableList;
@@ -13,12 +28,7 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-/**
- * Converter for ADK Events to A2A Messages.
- *
- * <p>**EXPERIMENTAL:** Subject to change, rename, or removal in any future patch release. Do not
- * use in production code.
- */
+/** Converter for ADK Events to A2A Messages. */
 public final class EventConverter {
   private static final Logger logger = LoggerFactory.getLogger(EventConverter.class);
 

a2a/src/main/java/com/google/adk/a2a/converters/PartConverter.java

@@ -1,3 +1,18 @@
+/*
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package com.google.adk.a2a.converters;
 
 import static com.google.common.collect.ImmutableList.toImmutableList;
@@ -32,12 +47,7 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-/**
- * Utility class for converting between Google GenAI Parts and A2A DataParts.
- *
- * <p>**EXPERIMENTAL:** Subject to change, rename, or removal in any future patch release. Do not
- * use in production code.
- */
+/** Utility class for converting between Google GenAI Parts and A2A DataParts. */
 public final class PartConverter {
 
   private static final Logger logger = LoggerFactory.getLogger(PartConverter.class);

a2a/src/main/java/com/google/adk/a2a/converters/ResponseConverter.java

@@ -1,3 +1,18 @@
+/*
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package com.google.adk.a2a.converters;
 
 import static com.google.common.collect.ImmutableList.toImmutableList;
@@ -27,12 +42,7 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-/**
- * Utility for converting ADK events to A2A spec messages (and back).
- *
- * <p>**EXPERIMENTAL:** Subject to change, rename, or removal in any future patch release. Do not
- * use in production code.
- */
+/** Utility for converting ADK events to A2A spec messages (and back). */
 public final class ResponseConverter {
   private static final Logger logger = LoggerFactory.getLogger(ResponseConverter.class);
   private static final ImmutableSet<TaskState> PENDING_STATES =

a2a/src/main/java/com/google/adk/a2a/executor/AgentExecutor.java

@@ -1,3 +1,18 @@
+/*
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package com.google.adk.a2a.executor;
 
 import static java.util.Objects.requireNonNull;
@@ -44,12 +59,7 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-/**
- * Implementation of the A2A AgentExecutor interface that uses ADK to execute agent tasks.
- *
- * <p>**EXPERIMENTAL:** Subject to change, rename, or removal in any future patch release. Do not
- * use in production code.
- */
+/** Implementation of the A2A AgentExecutor interface that uses ADK to execute agent tasks. */
 public class AgentExecutor implements io.a2a.server.agentexecution.AgentExecutor {
   private static final Logger logger = LoggerFactory.getLogger(AgentExecutor.class);
   private static final String USER_ID_PREFIX = "A2A_USER_";

a2a/src/main/java/com/google/adk/a2a/executor/AgentExecutorConfig.java

@@ -1,3 +1,18 @@
+/*
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package com.google.adk.a2a.executor;
 
 import com.google.adk.a2a.executor.Callbacks.AfterEventCallback;